A Pink Flower ~ but a Wild Flower?

A Pink Flower ~ but a Wild Flower?

Observation - A Pink Flower ~ but a Wild Flower?. Description: I have looked this up without any success. I do wonder though whether it's a cultivated flower growing in the wild? I saw it by the Thames Path in the Crossness area (SE London).

I have looked this up without any success. I do wonder though whether it's a cultivated flower growing in the wild? I saw it by the Thames Path in the Crossness area (SE London).